imap: use git-cat-file asynchronously

This ought to improve overall performance with multiple clients.
Single client performance suffers a tiny bit due to extra
syscall overhead from epoll.

This also makes the existing async interface easier-to-use,
since calling cat_async_begin is no longer required.

1 files changed, 0 insertions, 1 deletions

diff --git a/t/git.t b/t/git.t
index b05ac123..0b2089ba 100644
--- a/t/git.t
+++ b/t/git.t
@@ -40,7 +40,6 @@ use_ok 'PublicInbox::Git';
         my $arg = { 'foo' => 'bar' };
         my $res = [];
         my $missing = [];
-        $gcf->cat_async_begin;
         $gcf->cat_async($oid, sub {
                 my ($bref, $oid_hex, $type, $size, $arg) = @_;
                 $res = [ @_ ];